A Chinese electronics component manufacturer says its products inadvertently played a role in a massive cyberattack that disrupted major internet sites in the U.S. on Friday.

Hangzhou Xiongmai Technology, a vendor behind DVRs and internet-connected cameras, said on Sunday that security vulnerabilities involving weak default passwords in its products were partly to blame.

According to security researchers, malware known as Mirai has been taking advantage of these vulnerabilities by infecting the devices and using them to launch huge distributed denial-of service attacks, including Friday’s outage.

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